ci: bump peter-evans/create-pull-request from 6 to 8 (#148)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/generate-command.yml

@@ -260,7 +260,7 @@ jobs:
             - name: Create Pull Request
               if: ${{ !inputs.dry_run && steps.changes.outputs.has_changes == 'true' && github.event.inputs.pr == '' }}
               id: create-pr
-              uses: peter-evans/create-pull-request@v6
+              uses: peter-evans/create-pull-request@v8
               with:
                   token: ${{ steps.app-token.outputs.token || secrets.GITHUB_TOKEN }}
                   commit-message: "chore: regenerate SDK with Speakeasy"